Updated Polish translation
Use #ifdef to check for defines, not #if
Avoid multi-byte sequences that are not UTF-8

Replace multi-byte sequences in string literals with octal escape
sequences. Convert apetaglib.c from ISO-8859-2 to UTF-8.
Add static to more variable declarations

Remove some unused variables, caught by making them static.
Rewrite the CRC32 function

Simplify the error handling and be more specific about data types.
Fixed several typos and errors in strings
Updated Spanish translation
Updated Polish translation
Use the empty string for empty image descriptions

Passing NULL to the underlying
FLAC__metadata_object_picture_set_description() is incorrect according
to the API reference, and has previously caused some downstream bugs:
https://bugs.launchpad.net/ubuntu/+source/easytag/+bug/558804 and
https://bugzilla.redhat.com/show_bug.cgi?id=559828
Use the XDG music directory as the default path

If no music directory is set, use the home directory as before.
Conditionally compile win32 compatibility code

If a Windows (strictly mingw) host is detected during configure, compile
the Windows compatibility wrapper functions.
Check for [f]truncate and gethostbyname

Check for ftruncate and truncate during configure, and use wrappers on
Windows. Check for gethostbyname so that the Winsock library (ws2_32) is
added to LIBS on Windows.
Several fixes to compile for mingw
Avoid redefining LOCALEDIR, LIBDIR, DATADIR
Improve windows.h versus winsock2.h include order

winsock2.h must be included before windows.h.
Small NSIS installer script improvements

Generate the NSIS installer script with a Makefile rule. Substitute
several variables from the Makefile to make the script more generic.
Hardcode the DLL paths to those found on a Fedora mingw installation
(for now).
Update .gitignore for mingw builds
Remove obsolete mingw build files

They are no longer required now that the mingw build has been merged
into the rest of the build system.
Move pixmaps to data/pixmaps
Remove some old XPM icons